Well i think that for 3d bencher in sli/cf its good to have 2 x16 slots gt4 does notice. i have more cpu and slightly tigher rams but easy 6-7k more with the cards in proper spots.
01 was ok for 1k more too @ identical speeds.
1 x16 1 x8
both x16 (yes more cpu but gains mostly from gt4)

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